841 results about "Magnetization" patented technology

The invention discloses a concrete structure steel bar corrosion rate magnetic evaluation method for eliminating stress interference, and relates to the technical field of civil engineering. Comprising the following steps: scanning spontaneous leakage magnetic field intensity of reinforcing steel bars before and after concrete structure corrosion, and calculating spontaneous leakage magnetic field change information of the corroded reinforcing steel bars; determining the concrete structure reinforcement corrosion type according to the spontaneous leakage magnetic field change information of the corroded reinforcement; calculating a concrete structure steel bar magnetization intensity change rate caused by stress change before and after concrete structure corrosion; calculating a spontaneous magnetic flux leakage quantitative index according to the corrosion type of the concrete structure steel bar; the spontaneous magnetic flux leakage quantitative index is corrected according to the concrete structure steel bar corrosion type and the concrete structure steel bar magnetization intensity change rate; and calculating a concrete structure steel bar corrosion rate evaluation value for eliminating stress interference. According to the method, the existing spontaneous magnetic flux leakage assessment method for the corrosion rate of the bare steel bar is greatly improved, the stress change interference can be quantitatively corrected, and the high-precision estimation of the corrosion rate of the steel bar in the concrete structure is realized.

The invention discloses a detection method of an ocean magnetic field sensor based on a diamond NV color center. The detection method comprises the following steps: S1, calibrating a base line; s2, alternately measuring fluorescence between two single quantum resonance frequencies, and obtaining a difference to realize DQ reading; s3, three-axis compensation current is adjusted based on closed-loop control, and the NV working point is maintained at zero magnetization bias; s4, obtaining background magnetic field change through digital demodulation and adaptive filtering; and S5, calculating a gradient based on the spatial difference of the multi-point light spots, judging the existence and trajectory of the underwater vehicle in combination with a threshold value and a spectrum matching method, calibrating the threshold value according to the magnetic field characteristics of the existing underwater vehicle, adopting short-time Fourier transform signal spectrum, comparing the threshold value with known submarine characteristic spectrum data, and prompting if the similarity exceeds a set threshold value. According to the detection method, the measurement precision and the anti-interference capability can be improved, and the method is suitable for real-time monitoring of weak magnetic anomalies (such as magnetic moment disturbance of an underwater vehicle).

The invention discloses an elevator steel wire rope detection device and method, and the device comprises the following steps: firstly, carrying out the pre-scanning of an initial magnetic field, then carrying out the magnetization of a steel wire rope through a multi-stage adjustable electromagnet, and controlling the magnetization intensity through a current; the method comprises the following steps: firstly, pre-scanning a magnetic field, then, carrying out real-time monitoring and feedback control on the magnetized magnetic field, carrying out synchronous acquisition through a multi-modal sensor, then, extracting multi-domain features, receiving a feature vector set by a model, carrying out dynamic weighting operation on the feature vector set, and finally, outputting a task. The problem that initial magnetic fields of the steel wire ropes are inconsistent can be effectively solved, data are synchronously collected through the multi-mode sensor, effective distinguishing and quantitative evaluation of different types of defects such as wire breakage, abrasion, corrosion and fatigue damage are achieved, and the defects of an existing detection mode in defect subdivision and quantification are overcome.

The invention relates to a double-color magnetic nanoparticle imaging method based on a single-harmonic system matrix, which comprises the following steps: respectively moving two different types of magnetic nanoparticle samples to a central zero magnetic field point, applying a scanning magnetic field to enable the zero magnetic field point to scan the whole imaging field of view, applying an excitation magnetic field to magnetize magnetic nanoparticles, and applying an excitation magnetic field to magnetize the magnetic nanoparticles; acquiring magnetization frequency spectrum signals of the two magnetic nanoparticle samples; the method comprises the following steps: constructing single harmonic system matrixes A1 and A2 based on single harmonic of magnetization spectrum signals of two kinds of magnetic nanoparticle samples; measuring a to-be-measured object formed by the two kinds of magnetic nanoparticles to obtain a measurement magnetization signal U; transversely splicing the single harmonic system matrixes A1 and A2 of the two different types of magnetic nanoparticles to obtain a new single harmonic system matrix A; the concentration distributions c1 and c2 of two different types of magnetic nanoparticles are obtained by combining a new single-harmonic system matrix A with a measurement magnetization signal U, and the concentration distributions of the two different types of magnetic nanoparticles are respectively sent into different color channels to be displayed in different colors. The method has important significance in promoting the application of the magnetic nanoparticle imaging technology in clinical medicine.

The invention relates to an active source magnetization-time domain electromagnetic induction polarization multi-parameter extraction method, and provides an active source magnetization-time domain electromagnetic induction polarization multi-parameter extraction method aiming at induction response caused by conductivity, polarization response caused by chargeable property and magnetization response caused by magnetic complex physical property in polymetallic ore detection. When the emission current is in a flat-topped stage, based on an active magnetic method, magnetic susceptibility extraction is carried out by using an Oxim method; when the emission current is in a turn-off stage, resistivity and polarization extraction is carried out by using a depth Q network method based on a time domain electromagnetic method by taking the extracted magnetic susceptibility as a constraint condition; and finally, multi-parameter extraction of resistivity, polarizability and magnetic susceptibility of the active source magnetization-time domain electromagnetic induction polarization method is realized.

The invention relates to a multi-pole magnetic field magnetizing test method and a spiral winding group thereof, and relates to the field of automatic magnetizing technology, and the method comprises the steps: constructing a test model, importing design parameters of a magnet to be tested, determining a multi-pole magnetic field distribution theoretical model, and defining a magnetic pole region and a key feature contour line; acquiring magnetic field data, scanning the surface of the magnetized magnet by using an array probe, and acquiring magnetic field intensity actual measurement data of a multi-dimensional coordinate; matching a magnetic pole contour, comparing an actually measured contour line with a theoretical contour line, and establishing sampling point mapping; correcting the deviation data, screening the deviation sampling points exceeding the threshold value, and determining magnetizing process adjustment parameters; and evaluating the magnetizing efficiency, carrying out iterative magnetizing based on the correction parameters, and generating an evaluation report containing indexes such as magnetic field uniformity and the like. The method has the effect of improving the magnetic field intensity and stability of the magnet during orientation magnetization.

The invention belongs to the technical field of magnetic particle imaging, and relates to a magnetic particle imaging method based on mixed-frequency magnetic field excitation, which comprises the following steps: acquiring a dotted magnetic nanoparticle sample and a to-be-imaged object, respectively applying a mixed-frequency excitation magnetic field in an imaging mode to the dotted magnetic nanoparticle sample and the to-be-imaged object, acquiring a mixed frequency magnetic field excitation-based system matrix and a mixed frequency domain magnetization response frequency spectrum signal; and inputting the system matrix and the mixed frequency domain magnetization response frequency spectrum signal into a concentration spatial distribution inversion model to perform concentration spatial distribution inversion of the magnetic nanoparticles, obtaining the concentration spatial distribution of the magnetic nanoparticles in the object to be imaged, and performing magnetic particle concentration distribution imaging. According to the invention, real-time high-resolution magnetic particle imaging can be realized.

The invention provides a magnetization capacitance coupling plasma discharge system and a calculation model and a calculation method thereof in the technical field of plasmas, the plasma discharge system comprises a vertical cylindrical hollow closed cavity, and the cavity is filled with argon; a circular driving electrode is coaxially arranged at the top of the cavity, and a circular grounding electrode is coaxially arranged at the bottom of the cavity; three electromagnetic coils are coaxially arranged around the periphery of the chamber at intervals from top to bottom; a radio frequency voltage is applied between the grounding electrode and the driving electrode, so that argon in the chamber can be subjected to discharge ionization to generate plasma; and excitation current is introduced into the three electromagnetic coils for generating an external magnetic field in the chamber, so that the density of plasma generated by argon ionization in the chamber can be improved. The magnetization capacitance coupling plasma discharge system provided by the invention can optimize the property of the plasma, improve the density and performance of the plasma, and better provide a basis for the improvement of a plasma process technology.

The method includes: switching (1202), in a magnetically-operated actuator, between a first mechanical state and a second mechanical state using either a first internal magnetization configuration or a second internal magnetization configuration; after the switching (1202), measuring (1204), by a magnetic sensor, a prevailing magnetic field caused by the magnetically-operated actuator, testing (1206) the prevailing magnetic field against a predetermined condition, and based on the testing (1206), detecting (1208) whether the switching between the first mechanical state and the second mechanical state was completed or not completed.

The present invention discloses an ultra-thin flexible magnetic adsorption eyelash magnetic sheet and a preparation method thereof, which relates to the technical field of magnetic adsorption eyelashes. Each group of eyelash magnetic sheets is composed of upper and lower magnetic sheets. Opposite adsorption magnetic poles are arranged on the two magnetic sheets respectively, and the magnetism of the opposite adsorption magnetic poles shows a gradient distribution of strong at the edge and weak in the middle on the magnetic sheet. The raw materials of the magnetic sheet include samarium iron nitride magnetic powder and polypropylene. Samarium iron nitride is non-toxic and resistant to sweat corrosion, and polypropylene meets the cosmetic grade standard, improving the biological safety and solving the problem of unreliable materials for traditional magnetic adsorption eyelashes. The magnetic sheet is designed as an opposite adsorption magnetization structure, and the upper and lower magnetic sheets can achieve firm adsorption, overcoming the defect of easy falling off of traditional magnetic adsorption eyelashes. The thickness is only 0.14 - 0.24 mm, and it does not break after being folded more than 500 times, conforming to the curvature of the eye, being comfortable to wear, and avoiding the defect of heaviness of traditional magnetic adsorption eyelashes.

The invention discloses a mining intrinsic safety type steel wire rope non-contact magnetization detection integrated device, which relates to the technical field of steel wire rope magnetization sensor detection, and comprises a first detector shell, a second detector shell, a first permanent magnet, a second permanent magnet and two magnetic sensors, the first detector shells and the second detector shells are arranged in pairs, and the edges of the same sides of the first detector shells and the second detector shells are connected; according to the invention, the splitting of the two detector shells is not influenced, the steel wire rope can be easily put into any section of position of the steel wire rope, the magnetic field of the permanent magnet can still magnetize the steel wire rope when the steel wire rope is closed, and the position of the fixed wheel can be changed according to the diameter of the steel wire rope, so that the axis of the steel wire rope is located in the middle of the middle shield; the influence of the magnetic field on the steel wire rope or the electronic structure difference of the detected steel wire rope is consistent, and the accuracy of detecting the internal damage of the steel wire rope by the magnetic sensor is improved.

The invention provides a linear Halbach array based on a non-uniform permanent magnet and a preparation method of the linear Halbach array, and belongs to the field of permanent magnets. The method comprises the steps that the interior of a mold is divided into an area A1, an area A2 and an area B, wherein the area A1 and the area A2 are symmetrical on the two sides and concave in an arc shape; the B area is loosely filled with low-grade magnetic powder, and the A1 area and the A2 area are loosely filled with high-grade magnetic powder; carrying out compression molding and magnetization orientation to obtain a neodymium iron boron pressed blank; the neodymium-iron-boron pressed blank is subjected to heat treatment after being demolded to obtain the non-uniform permanent magnet, and the heat treatment comprises preheating, gradient sintering of first heating and then cooling, and tempering treatment; and (2n + 3) groups of non-uniform permanent magnets are adhered and fixed by using magnet glue to obtain the linear Halbach array. According to the non-uniform permanent magnet, the non-uniform permanent magnet is manufactured by adopting different marks of magnetic powder partition mold pressing, region strengthening is carried out on the edge, the demagnetization effect of the magnet at the corner angle under the extreme condition is reduced, the local intrinsic coercive force is improved, the service performance of the magnet is enhanced, and the performance of a Halbach array assembled by the non-uniform permanent magnet is promoted to be more excellent.

The invention provides an asymmetric electrode spin probability bit device and a control method thereof, and relates to the technical field of spin probability bits. The asymmetric electrode spin probability bit device comprises a spin conversion layer which is set to be an asymmetric electrode structure and is configured to convert injected pulses into in-plane spin gradient flows under the action of an asymmetric electric field formed by the asymmetric electrode structure; the magnetic free layer is arranged on the surface of the spin conversion layer; wherein the in-plane spin gradient flow is regulated and controlled based on the size and the pulse direction of the injected pulse so as to control the size and the direction of the out-of-plane effective field borne by the magnetic free layer; according to the out-of-plane effective field, the magnetization state of the magnetic free layer is switched between a first magnetization state and a second magnetization state under the condition of any initial magnetization state, and the probability of switching to any magnetization state between the first magnetization state and the second magnetization state is regulated and controlled, the magnetization directions of the first magnetization state and the second magnetization state are opposite.

The invention relates to the technical field of nanometer oscillators, in particular to a nanometer oscillator based on magnetic skyrmion, an oscillator array and an oscillation method, and the nanometer oscillator comprises a first heavy metal layer, a first magnetic layer, a second heavy metal layer, an insulating layer, a third heavy metal layer, a second magnetic layer and a fourth heavy metal layer. According to the nano oscillator, the central positions of the first skyrmion in the first magnetic layer and the second skyrmion in the second magnetic layer are fixed, and the area of the skyrmion is periodically oscillated under the action of the direct current driving current, so that the magnetization intensity component in the axial direction (Z axis) in the magnetic layers is periodically oscillated, and the stability of the magnetic layer is improved. Therefore, a detection structure for detecting the microwave signal of the nano oscillator can be simplified, for example, the diameter of the detection structure is the same as that of the magnetic layer.

The invention discloses a method, a system and equipment for calculating a three-dimensional form of an iron ore body. The method comprises the following steps: acquiring magnetic anomaly data and a magnetic anomaly region of a known hidden magnetite body in a target region; the first top surface burial depth of the magnetite body is calculated or obtained through drilling data based on the magnetic anomaly area, and magnetization intensity three-dimensional distribution of the magnetic anomaly area is obtained; delineating a magnetic body range smaller than preset magnetization intensity according to the first top surface burial depth of the magnetite body and the magnetization intensity three-dimensional distribution; calculating the second top surface depth of the iron ore body according to the preset magnetization intensity, and counting the minimum value of the difference between the second top surface depth and the first top surface burial depth; and extracting a magnetization intensity distribution range which is greater than the inversion of the minimum value of the depth difference in the magnetization intensity inversion result, and calculating the form numerical value of the iron ore body according to the magnetization intensity distribution range.

The application relates to a TMR magnetic sensor, comprising: a plurality of inclined structures, each inclined structure being arranged along a first axis and comprising a first inclined surface and a second inclined surface symmetrically arranged along the first axis; the first magnetic induction pairs are used for inducing a third-axis magnetic field, each first magnetic induction pair comprises a first magnetic resistance element and a second magnetic resistance element, and the first magnetic resistance elements and the second magnetic resistance elements are formed by combining the same number of magnetic tunnel junctions in the same mode; the magnetic tunnel junctions of the first magnetic resistance element and the second magnetic resistance element are respectively arranged on a first inclined surface and a second inclined surface which are of an inclined structure and have the same axis; the magnetic tunnel junctions of the first magnetoresistive element and the second magnetoresistive element have initial magnetization directions along a first axis and have the same positive and negative, the magnetic tunnel junctions of the first magnetoresistive element and the second magnetoresistive element have pinning directions along the inclined planes, the components of the pinning directions on the second axis are opposite in positive and negative, and the components of the pinning directions on the third axis are the same in positive and negative. The cross-axis interference can be reduced, and the detection anti-interference capability is improved.

The invention provides a Brown relaxation dominated magnetic nanoparticle nonlinear biological information parameter estimation method. The method comprises the following steps: putting a container of a magnetic nanoparticle sample into a to-be-detected object area; applying low and medium frequency alternating current magnetic field excitation to the magnetic nanoparticle sample; collecting magnetization response information of the magnetic nanoparticle sample in real time and extracting harmonic amplitude information from the magnetization response information; carrying out series expansion on the Fokker-Planck equation by using a disturbance expansion method, and deducing a harmonic analytical expression under the Brown relaxation condition; respectively establishing a corresponding temperature estimation model and a hydrodynamic diameter estimation model on the basis of the harmonic analytical expression; respectively substituting the measured harmonic amplitude information into a temperature estimation model or a hydrodynamic diameter estimation model based on a harmonic analytical expression; and respectively solving an equation set formed by the temperature estimation model or the hydrodynamic diameter estimation model to obtain temperature information or hydrodynamic diameter information. According to the invention, the measurement precision and the time resolution of the magnetic nanometer temperature measurement and biomarker identification tool can be improved.

An alternating-current electromagnetic field stress measurement system, comprising: an excitation signal generation module, an alternating-current electromagnetic field stress measurement stress probe, a signal amplification circuit, an A / D conversion circuit and a processor, wherein the excitation signal generation module is used for loading a sinusoidal alternating-current signal to an excitation coil of the alternating-current electromagnetic field stress measurement stress probe, such that a periodically changing electric field is generated on a measured magnetic object; the alternating-current electromagnetic field stress measurement stress probe is used for sequentially routing a stress characterization signal, which is detected from the measured magnetic object, through the signal amplification circuit and the A / D conversion circuit, and then sending the stress characterization signal to the processor; and the processor is used for processing the received stress characterization signal by using an optimized J-A model in which an implicit equation originally characterizing a change in the magnetization intensity or magnetic induction intensity along with stress is made explicit, so as to calculate the stress of the measured magnetic object. The alternating-current electromagnetic field stress measurement system can monitor the stress increase trend in real time, and notice potential dangers in time. Further comprised is an alternating-current electromagnetic field stress measurement method and a computer program for executing the alternating-current electromagnetic field stress measurement method.

The invention relates to a large-negative-stiffness magnetic spring device for heavy-load low-frequency vibration suppression. The large-negative-stiffness magnetic spring device comprises an inner magnetic ring pile structure and an outer magnetic ring pile. The inner magnetic ring pile structure can reciprocate in the hollow part of the outer magnetic ring pile; the inner magnetic ring pile structure comprises an upper magnetic ring pile and a lower magnetic ring pile; the upper magnetic ring pile and the lower magnetic ring pile respectively comprise a plurality of inner magnetic rings which are coaxially arranged; the outer magnetic ring pile comprises a plurality of outer magnetic rings which are coaxially arranged; in the axial direction of the inner magnetic ring pile structure, the inner magnetic ring pile structure is provided with a first symmetry plane, and the magnetization directions of the inner magnetic rings of the upper magnetic ring pile and the lower magnetic ring pile are symmetrical about the first symmetry plane; in the axial direction of the outer magnetic ring pile, the outer magnetic ring pile is provided with a second symmetry plane, and the magnetization direction of outer magnetic rings in the outer magnetic ring pile is symmetrical about the second symmetry plane; when the first symmetry plane and the second symmetry plane coincide, the resultant magnetic force between the inner magnetic ring pile structure and the outer magnetic ring pile structure is zero, and the maximum negative stiffness is generated. According to the scheme, the low-frequency vibration is effectively suppressed.

A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved.

The invention discloses an anti-magnetic suspension accelerometer device based on a quasi-zero stiffness structure and a measurement method, and belongs to the field of precise instruments and meters. The device comprises a support, an axial displacement platform, magnetic conductive soft iron, an upper-layer pyrolytic graphite sheet, a lower-layer thin bismuth wafer, a capacitance displacement sensor and a permanent magnet array, wherein an anti-magnetic suspension system, a magnetic rigidity regulation and control system and a displacement detection system are arranged in the support; the anti-magnetic suspension system is composed of an upper-layer pyrolytic graphite sheet, a lower-layer thin bismuth wafer and a permanent magnet array, the magnetization directions of an inner ring and an outer ring of the permanent magnet array are opposite, a suspension element is suspended by virtue of anti-magnetic force and gravity balance, and quasi-zero stiffness is realized through positive and negative stiffness offset; according to the regulation and control mode, the magnetic field of the air gap where the suspension element is located is adjusted by adjusting the distance between the magnetic conductive soft iron and the permanent magnet, and the magnitude and gradient of magnetic induction intensity in all directions are changed, so that the magnetic rigidity is regulated and controlled, and efficient and accurate regulation and control of the sensitivity and the measuring range of the anti-magnetic suspension accelerometer are achieved. Therefore, the application range of the anti-magnetic suspension accelerometer is expanded.

The invention discloses a high-temperature-resistant coating type magnetostrictive ultrasonic transducer, and belongs to the field of ultrasonic nondestructive testing. The transducer is composed of a high-temperature-resistant ceramic coil and a high-temperature-resistant magnetostrictive coating prepared on the basis of Fe3O4 / AlNiCo composite powder. The method comprises the following steps: firstly, spraying Fe3O4 / AlNiCo composite powder to the surface of a to-be-detected workpiece to form a magnetostrictive coating tightly combined with the surface of the workpiece as a sensing unit for exciting and receiving ultrasonic waves; then carrying out magnetization treatment on the coating by utilizing a magnetization device, and establishing a stable static bias magnetic field; removing the magnetizing device, and applying a pulse current signal in the ceramic coil to generate a dynamic alternating magnetic field; finally, based on the magnetostrictive effect, ultrasonic waves are excited and received in the coating, and detection of defects in the to-be-detected workpiece is achieved. The transducer has the advantages of high temperature resistance and high signal-to-noise ratio, and is suitable for rapid spot check detection and long-term online monitoring of structures such as high-temperature pipelines and high-temperature pressure vessels.

A magnetic sensor element includes a pinned layer, a first non-magnetic layer, a first magnetic layer, and a free layer. The pinned layer has a fixed magnetization direction. The first non-magnetic layer is laminated on the pinned layer. The first magnetic layer holds the first non-magnetic layer with the pinned layer. The free layer is disposed along a lamination direction in which the first non-magnetic layer is laminated on the pinned layer. Each of the first magnetic layer and the free layer has a magnetization direction more easily changed by an external magnetic field than that of the pinned layer. The pinned layer and the first magnetic layer are coupled by indirect exchange interaction.

The invention discloses an AMR magnetoresistive sensor, and mainly solves the technical problem that the detection precision of an existing AMR sensor is easily affected by an external interference magnetic field. Each bridge arm of the Wheatstone bridge is correspondingly connected with a magnetoresistive element in series, and the angle difference of the magnetization directions of the magnetoresistive elements at the adjacent bridge arms is within the range of 180 + / -delta degrees. According to the AMR sensor, the anti-ferromagnetic layer is arranged, and the shape of the anti-ferromagnetic layer is the same as that of the magnetoresistive effect layer, so that compared with an existing AMR sensor, a tedious and complicated exposure process can be omitted, and the purpose of simplifying the process is achieved. And the magnetization directions of the magnetoresistive elements at the adjacent bridge arms in the sensor bridge circuit are basically opposite, so that adverse effects caused by an interference magnetic field can be counteracted when the external interference magnetic field exists, the sensitivity of the sensor is prevented from being greatly changed, and the magnetic field measurement accuracy of the sensor is ensured.

The invention discloses a magnetic electronic device for generating track torque by using a metal vanadium or titanium track Hall effect and a manufacturing method thereof. The device comprises a substrate, a track Hall structure containing a vanadium or titanium layer, and a heavy metal layer and a ferromagnetic layer which are adjacent to the track Hall structure, when a charge current passes through the vanadium or titanium layer, a transverse track current is generated based on the track Hall effect, and the track current is injected into the ferromagnetic layer and then converted into an effective track torque for controlling the magnetization state of the ferromagnetic layer. Preferably, the ferromagnetic layer has a perpendicular magnetic anisotropy. According to the invention, the light transition metal vanadium or titanium is used as the track Hall material, the experiment proves that a huge track Hall angle greater than 0.45 can be obtained, and meanwhile, the resistivity of the material is lower, so that the shunting phenomenon can be reduced in an actual device, and the critical current density for realizing write-in flipping can be obviously reduced. The device is simple in structure and compatible with an existing semiconductor process, and a brand new material platform is provided for developing a low-power-consumption and high-density magnetic random access memory (MRAM).

A spherical tank welding seam magnetization array eddy current wall-climbing detection robot disclosed by the present invention comprises a vehicle frame, two wheels, a driving mechanism and a detection mechanism, the two wheels are rotatably arranged on the vehicle frame at an interval, the two wheels are permanent magnets, the inner rings and the outer rings of the wheels have different magnetisms, and the driving mechanism and the detection mechanism are arranged on the vehicle frame. And the inner rings of the two wheels are opposite in magnetism. The array eddy current detection mechanism has the beneficial effects that the magnetic fields of the two permanent magnets form a magnetic circuit in a detected welding seam area, and the magnetic fields uniformly diffused to the periphery of the two permanent magnets are gathered in the magnetic circuit in the detected welding seam area, so that the interference of the peripheral diffused magnetic fields on the detection mechanism is reduced, and the stability of array eddy current detection signals is ensured; the magnetic flux density of the detected welding seam area can be increased, the detected welding seam area is further magnetized, the relative permeability of the detected welding seam area is reduced, the detection depth of the array eddy current detection signal can be greatly increased, and therefore cracks in the deep position of the welding seam can be detected.

The utility model discloses a novel water magnetizing device for cleansing lotion inner material production. The novel water magnetizing device comprises a shell, a water inlet connected to the top end of the shell and a water outlet connected to the bottom end of the shell. An iron core is detachably arranged in the shell, a spiral water pipe is wound on the outer wall of the iron core, and the top end of the spiral water pipe is fixedly connected with the water inlet. According to the novel water magnetizing device for cleansing lotion inner material production, the wire is powered on, the iron core assists current to be better spread in the wire so as to enhance a magnetic field, and the spiral water pipe is designed to be spiral so that water can be more fully exposed in the magnetic field when flowing in the spiral water pipe through the water inlet; by means of the design, the contact area and time of water and a magnetic field are increased, so that the magnetization effect is improved, a stable magnetic field is generated in the shell in cooperation with the magnet ring, the magnetic field is overlapped with a magnetic field generated by the wire, the magnetic field intensity is further enhanced, and the magnetization effect of water in the spiral water pipe is improved.

A method for producing a magnet for a rotor of an electric machine has a first phase of producing a magnet blank which includes a step of pressing powders into a magnet mold in the presence of a magnetic field while subjecting the powders to a magnetic field generated by a first magnetization tool. The method further includes a step of densifying the obtained magnet blank and a second phase. The second phase includes finishing the magnet blank by at least one final magnetization step in order to obtain a magnet. The mold is arranged in a densifying chamber, and the densifying step is carried out by flash SPS sintering in the densifying chamber.

The invention provides a muon and aeromagnetic data fusion three-dimensional imaging method, a medium, equipment and a product, and relates to the technical field of geological exploration, the method comprises the following steps: dividing an object to be measured into a plurality of voxels with the same volume, and calculating the magnetization intensity and density value of each voxel according to aeromagnetic detection data and muon detection data; obtaining a magnetism-density physical parameter model; according to the magnetism-density physical parameter model, aeromagnetic inversion and muon inversion are carried out, and an objective function of aeromagnetic inversion and an objective function of muon inversion are established; establishing a joint constraint term, and combining the target function of aeromagnetic inversion and the target function of muon inversion to construct a target function of joint inversion; and solving the joint inversion target function to obtain an optimal magnetism-density value, and imaging the three-dimensional magnetism-density structure distribution in the geomorphic mineral product. According to the method, the magnetic and density abnormal structures in the complex landform can be determined at the same time, and the precision of the geophysical exploration technology is improved.

The invention discloses a method for simulating and predicting the demagnetization rate of a neodymium iron boron permanent magnet based on a physical field. The method comprises the following steps: establishing a three-dimensional model of a magnetic circuit of the permanent magnet, and calculating magnetic field distribution data; obtaining H field intensity of the N sampling points in the magnetization direction, and performing normalization processing to obtain an H / Jr ratio; arranging the H / Jr ratios of the N sampling points from small to large to obtain an H / Jr data set, and averagely distributing the total volume of the neodymium iron boron permanent magnet to the N sampling points; constructing a V (H / Jr) cumulative volume distribution curve; constructing a new relation curve V (H / Jr * (1-V)); and testing Hk and Jr of an actually produced neodymium-iron-boron permanent magnet blank at the demagnetization heat preservation temperature, and substituting the ratio Hk / Jr as a horizontal coordinate value into the new relation curve V (H / Jr * (1-V)) to obtain a predicted value of the demagnetization rate. The method is good in universality, quantitative characterization can be carried out on the demagnetization rate of the neodymium iron boron permanent magnet with a specific geometrical shape and magnetic circuit design, and quantitative and numerical accurate prediction of the demagnetization rate is achieved.